1898161 has 4 divisors (see below), whose sum is σ = 1959424. Its totient is φ = 1836900.

The previous prime is 1898153. The next prime is 1898179. The reversal of 1898161 is 1618981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1898161 - 2³ = 1898153 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1898131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30585 + ... + 30646.

It is an arithmetic number, because the mean of its divisors is an integer number (489856).

2^1898161 is an apocalyptic number.

It is an amenable number.

1898161 is a deficient number, since it is larger than the sum of its proper divisors (61263).

1898161 is an equidigital number, since it uses as much as digits as its factorization.

1898161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61262.

The product of its digits is 3456, while the sum is 34.

The square root of 1898161 is about 1377.7376383042. The cubic root of 1898161 is about 123.8162601317.

The spelling of 1898161 in words is "one million, eight hundred ninety-eight thousand, one hundred sixty-one".